VSC7440 datasheet(214/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

197

•

Policer triggering flow control can be identified

(ANA_AC_POL:POL_ALL_CFG:POL_STICKY.POL_PORT_FC_STICKY).

•

Policer leaving flow control state can be identified

(ANA_AC_POL:POL_ALL_CFG:POL_STICKY.POL_PORT_FC_CLEAR_STICKY).

3.23.2.6 Storm Policing

Each storm policer entry contains the fields in the following table. The fields are all located within the

ANA_AC_POL:POL_ALL_CFG register group.

Frames applicable for policing are any frame received by the MAC and forwarded to the classifier. Short

frames (less than 148 bytes) with errors, pause frames, or MAC control frames are not forwarded by the

MAC and therefore not accounted for in the policers. That is, they are not policed and do not add to the

rate measured by the policers.

Storm policers are enabled by configuring the traffic type to be policed

(POL_STORM_CTRL.STORM_TRAFFIC_TYPE_MASK) and specifying a corresponding rate

(POL_STORM_RATE_CFG.STORM_RATE).

The policer burst capacity can be specified with 4K granularity (POL_STORM_THRES_CFG).

Policing of traffic destined for CPU port or ports can be controlled

(POL_STORM_CTRL.STORM_TRAFFIC_TYPE_MASK(7) = 0 and CPU bypass mask in

POL_STORM_CTRL.STORM_CPU_QU_MASK).

Storm policers can be configured individually to affect frames towards CPU ports

(POL_STORM_CTRL.STORM_LIMIT_CPU_TRAFFIC_ENA) or front ports

(POL_STORM_CTRL.STORM_LIMIT_NONCPU_TRAFFIC_ENA).

The following parameters can also be configured per policer.

•

Leaky bucket calculation can be configured to include or exclude preamble, inter-frame gap, and an

optional encapsulation (POL_ALL_CFG.STORM_GAP_VALUE).

•

Each policer can be configured to measure frame rates instead of bit rates

(POL_STORM_CTRL.STORM_FRAME_RATE_ENA).

Traffic dropped by a storm policer can be counted by the port statistic block.

The following storm policer debug events are available.

•

Dropping of traffic towards CPU due to policer can be identified

(POL_STICKY.POL_STORM_DROP_CPU_STICKY).

Table 126 •

Storm Policer Table Entry

Field

Bits

Description

STORM_TRAFFIC_TYPE_MASK

Configures the traffic types to be taken into account by the

policer.

STORM_FRAME_RATE_ENA

Configures frame rate mode for the ACL policer, where rates are

measured in frames per second instead of bytes per second.

STORM_LIMIT_NONCPU_TRAFFIC_ENA

Configures how policing affects traffic towards front ports.

STORM_LIMIT_CPU_TRAFFIC_ENA

Configures how policing affects traffic towards CPU.

STORM_CPU_QU_MASK

Configures policing of frames to the individual CPU queues for

the port policer (see TRAFFIC_TYPE_MASK).

STORM_GAP_VALUE

Configures the leaky bucket calculation to include or exclude

preamble, inter-frame gap and optional encapsulation through

configuration

STORM_THRES

Configures storm policer burst capacity.

STORM_RATE

Configures storm policer rate.

VSC7440 Datasheet(PDF) 214 Page - Microsemi Corporation

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